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Re: [stir] Making STIR SIP messages smaller

Chris Wendt <chris-ietf@chriswendt.net> Tue, 13 April 2021 17:28 UTC

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From: Chris Wendt <chris-ietf@chriswendt.net>
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Date: Tue, 13 Apr 2021 13:28:08 -0400
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Cc: Roman Shpount <roman@telurix.com>, Alec Fenichel <alec.fenichel@transnexus.com>, "stir@ietf.org Mail List" <stir@ietf.org>, Marc Petit-Huguenin <marc@petit-huguenin.org>
To: Christer Holmberg <christer.holmberg@ericsson.com>
References: <adc8bd10-a04d-aff5-e03f-183f0d59c22c@petit-huguenin.org> <CAD5OKxvqYSRjaA_eR=nX4sNgTbAtQ3dSqqgAe0-y9EzbA-dRug@mail.gmail.com> <AM0PR07MB386063A2162B5C07319225D393739@AM0PR07MB3860.eurprd07.prod.outlook.com> <CAD5OKxuyT4bmNBYgSMN-9M-c1Tr=gO1rQAg1D7xGSYx=bP9K3A@mail.gmail.com> <5308A309-85DC-4440-ABE9-6C1EEB4E0FEE@chriswendt.net> <CAD5OKxsRh5pgYbc6ULL2c7nCUuAfQiM=r78vxkd0WWg0veDkjA@mail.gmail.com> <E0562367-B7E8-4935-A71A-60D2C105F850@chriswendt.net> <BN6PR11MB39211A0A9BB35EB34E1789C599709@BN6PR11MB3921.namprd11.prod.outlook.com> <19194256-B61E-47D6-B1F6-5317F2F7BE90@chriswendt.net> <BN6PR11MB3921F5DBEA3719F5DB0C31BC99709@BN6PR11MB3921.namprd11.prod.outlook.com> <CAD5OKxsswce0vHSZdc1UYS6ie2D7ut6ZDmc8MUX7Jnzyim9utQ@mail.gmail.com> <AM0PR07MB3860C3C820955494240B8FE0934F9@AM0PR07MB3860.eurprd07.prod.outlook.com>
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Subject: Re: [stir] Making STIR SIP messages smaller
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Yes

> On Apr 13, 2021, at 5:39 AM, Christer Holmberg <christer.holmberg@ericsson.com> wrote:
> 
>  
> >I agree that we need to figure out a way to make Identity headers smaller. As it stands right now, the Identity header with "shaken" PASSporT type adds around 600 bytes to an INVITE message.
> >This makes typical SIP INVITE messages go from around 1K in size to 1.6K, which is bigger than the UDP MTU.
>  
> With or without Identity, didn’t that ship sail a long time ago? :)
>  
> Regards,
>  
> Christer
>  
>  
>  
> On Mon, Apr 12, 2021 at 5:39 PM Alec Fenichel <alec.fenichel@transnexus.com <mailto:alec.fenichel@transnexus.com>> wrote:
> I guess what I am trying to say is that I think we should remove ppt from the examples because as you say, people tend to code to examples and smaller Identity headers would be ideal.
>  
> I don’t mean to hijack this thread, but I have been meaning to bring this up anyways and it is related. Is there a reason I’m just overlooking for requiring the “info” parameter when a full-form PASSporT is used? If not, can we make it optional? The reason I ask is that with OOB, the transit provider receives a PASSporT out-of-band and then needs to construct an Identity header. Because of the “info” parameter requirement, the transit provider must decode the PASSporT in order to determine the “info” parameter. This is the only reason that a transit provider needs to decode the PASSporT. This isn’t difficult so it doesn’t really matter, but I figured I’d ask about potentially making the “info” parameter optional. Also, it makes the Identity header smaller which is always a good thing.
>  
> Sincerely,
>  
> Alec Fenichel
> Senior Software Architect
> alec.fenichel@transnexus.com <mailto:alec.fenichel@transnexus.com>
> +1 (407) 760-0036
> TransNexus

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